package org.apache.commons.graph.weight.primitive

import org.apache.commons.graph.weight.Monoid
import org.apache.commons.graph.weight.OrderedMonoid

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License.  You may obtain a copy of the License at
*
*   http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.
*/

/**
 * The class [FloatWeightBaseOperations] provides operations and properties
 * for weights of type [Float].
 */
object FloatWeightBaseOperations : OrderedMonoid<Float> {
    /**
     * {@inheritDoc}
     */
    override fun append(s1: Float, s2: Float): Float {
//        if (s1 == null || s2 == null) {
//            return null
//        }
        return s1 + s2
    }

    /**
     * {@inheritDoc}
     */
    override fun compare(s1: Float, s2: Float): Int {
        return s1.compareTo(s2)
    }

    /**
     * {@inheritDoc}
     */
    override fun identity(): Float {
        return 0.0f
    }

    /**
     * {@inheritDoc}
     */
    override fun inverse(element: Float): Float {
        return -element
    }

}

val Monoid.Companion.float get() = FloatWeightBaseOperations